dataset: https://archive.ics.uci.edu/ml/datasets/Breast+Cancer+Wisconsin+(Original)
Basic NN code: https://www.kdnuggets.com/2019/11/build-artificial-neural-network-scratch-part-1.html
NN with one hidden layer: https://pub.towardsai.net/building-neural-networks-with-python-code-and-math-in-detail-ii-bbe8accbf3d1
Alternative dataset: https://archive.ics.uci.edu/ml/datasets/Heart+Disease